/Engine/Source/Runtime/CoreUObject/Public/Serialization/BulkDataRegistry.h
Notify that a legacy BulkData with a PlaceholderPayloadId has loaded its data and updated its PayloadId, and the Registry should copy the updated PayloadId into the cache if it hasn't already calculated it.
void UpdatePlaceholderPayloadId ( const [UE::Serialization::FEditorBulkData](API\Runtime\CoreUObject\Serialization\FEditorBulkData) & BulkData )